the price tag may be higher, but the concentration is much higher...so the usable amount is MUCH less costly.
you'll notice the 75 WSB packets are 75% imidacloprid. One pouch makes 300 gallons. You can get 4 packets for $35. I prefer the 2F formulation because it is possible to make a smaller batch. It is a liquid and is 21.8%.
Sorry, I didn't see that Treestuff doesn't sell that by the quart....I assumed they do. I buy it elsewhere, but wanted to point you to a site sponsor...I have bought other things from treestuff and they are a good company and very prompt with shipping. I looked at the place I buy it from, and the don't have 2F by the quart either...only gallon. I buy it by the gallon, so hadn't notice that. Search for "Imidacloprid 2F" or Merit 2F (that is the name brand). If you have a local farm chemical or fertilizer store/co-op in your area they can probably get it for you. Should be about $35-45 per quart... If you are using 2%, that should take you 10-11 times as far as what you are currently using.
I haven't seen the 2F formulation in a container smaller than a quart or the packets in a lower concentration/fewer packets.